First off, This is a Shoujo manga and it much be treated as such. means kick ass protagonist, obvious plot line, simplicity, drama over drama, and a romantic note with an equally obvious pairing! If you are not into Shoujo you most probably won't enjoy this manga. Art: The art is very high Quality and beautiful, just a look inside the manga will give you a very good impression Characters: Ran the protagonist is the archetype of kick ass cross dressing female characters in shoujo manga. Powerful, Beautiful, Kind, Strict, Protective, Honest to the bone, but also Soft, Elegant, Romantic and Caring. The portrayal ofthe "perfect man" that only a girl can pull off.
Sei the rich girl, it also follows the Archetype in shoujo with the rich girl being also very kind, elegant, smart, selfless, noble to the bone, all in all a true Queen
Ibara is the character who maybe is not the perfect guy but his goodness and honesty make him very likable

Enjoyment: Personally I enjoy this manga very much and I'm checking for updates everyday but that's only my personal taste.

Finally The Story:
A girl decides to live her life as a man, crossdresses herself and be a noble knight and protects the noble princess! A very successful recipe in Shoujo history.
It follows the standards of the very first shoujo manga, and brings back the wonderful feelings of the times back in 70's (when shoujo masterpieces existed)
Even though the story line is simple: "The first knight fights other candidates white gloved knights for the position of the first knight etc." the plot is open to twists, new characters come and go and even though you might have a view of what may be happened in the end of the story you want to know what kind of twists this story line is capable off. The plot is easy to follow, but not boring to the slightest.

If you are into shoujo manga and philosophy then try it!
Those who are familiar with "Rose of the Versailles" the story even though it is placed in different timeline, it has that kind of aura

Strong points: Art, the nobility of the 3 main characters, very mysterious villains, and the mystery of who is the big bad guy of the story!

a turn off for those who are not into shoujo is that, this manga is the epitome of shoujo :)